The ultraviolet LEDs will replace the mercury vapor lamps in water purification

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Led ultravioletto
by Carlo Sala 

Purify the water used by public aquariums as that used in industrial production cycles without using mercury, in turn polluting agent. And 'as it allows a system developed by a consortium of small and medium-sized companies with the Institute of Technology in Cork, Ireland, as part of the European research project "Water-Pulse."
Through the titanium dioxide (TiO2) and an ultraviolet light emitting diode (UV-LED Light Emetting Diode) is obtained by a process of photocatalysis avoiding the use of mercury vapor lamps today in current use for the sterilization of liquids. Lethal to bacteria, because it decomposes them, photocatalysis, titanium dioxide has proven in turn more effective and less impact of any other anti-microbial agent in the fight bacteria: it is non-toxic, has a low cost and a ' high efficiency photo-catalytic.
The operation of the system developed has been so illustrated by Patrick Dunlop, a researcher at the University of Ulster, Northern Ireland: "We load the glass spheres in a small container. Then we use the LED and radiate ultraviolet light coating of titanium dioxide. The water passes into the reactor, moves around the spiral, on the beads coated with titanium dioxide, and back into the aquarium passing through the pump. " "Modulate the power of ultraviolet light, we measure the amount of light rays that reach the surface in order to maximize the distance between the source and the surface - adds Natalia Rebrova, specializing in computer modeling - The rate of reaction depends on the chemical and physical the intensity of brightness and then you can calculate the speed at which the water is purified. "
The solution is still refined, but its market prospects appear promising. From a technical perspective, Cork Institute of Technology explain that "an image displayed on a screen shows us the intensity and distribution of the light emitted by the LED. We can use these data to characterize the device and work at an efficient level. These data are needed to define different models when we build the reactor. " From a commercial perspective - Niall Bolster observes, coordinator of the project "Water-Pulse" - LED technology to ultraviolet rays is already quite promising: "This technology is developing at an impressive rate. We are receiving more and more requests from people who do not currently use it, but I'm holding my breath, they want to know when the time is right to employ LEDs in their applications. "

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